The mass of an \( \alpha \)-particle is (A) Less than the sum of masses of two protons and two n...

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The mass of an \( \alpha \)-particle is
(A) Less than the sum of masses of two protons and two neutrons
(B) Equal to mass of four protons
(C) Equal to mass of four neutrons.
(D) Equal to sum of masses of two protons and two neutrons
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